To all whom it may concern



@einen tetes stent ffire.

SAMUEL 'MCGAMBRIDGE AND EDWARD G. MARTIN, OF PHILADELPHIA, PENN SYLVANIA Letters .Patent No. 80,420, dat-ed July 28, 1868.

IMPROVED GAR-BRAKE.

TO ALL WHOM IT MAY CONCERN: p y

Be it known-that we, SAMUEL McCnnnnInGE and EDWARD G. MARTIN, of thecityand county ofPhiladelphia, and VState of Pennsylvania, have inventedn new and useful gnprovemeutin Operating the Brake-Levers of a Train ofCars; and we do hereby declare that the following is a full and exactdescription thereof, reference being had to the accompanying drawings,and to the letters ofmeferenee marked thereon.

The nature of our invention consists in the combination of a: pulleywith the rearv truck of the last cnr of the train, and connecting oneend of' the continuous chain for operating `the brake-levers with thefront truck, weaving the chain around the sheaves ofthe levers, and thestationary sheaves under all the curs,'passing it around the said pulleyorv sheave, and thence directly to the engine, and. then connecting itwith a revolving shaft, operated by the engine. By this means weeB'eetually take up the slack ci' the continuous chain under the rearcar rst, and so on in succession, until the first car is reached, andcompletely prevent the bumping of the cars.

` In the accompanying drawings, whichmnke a part of this specification-4Figure 1 is a plan of the rear cnr with the improvement attached.

Figure l2 is a longitudinal section of the same at a: w, iig. 1.

Like letters in both figures indicate the same parts.

Ais the bottom frame of the lasttear of the train.

B B are the trucks.

Y C is a. continuous chain, which is passed around the pulley or shcavea, wovcnlaroun'd the sheaves b of the Y brake-levers D and the xedsheaves c, as represented in theA drawings, and continued throughout allthe cars,

the end being secured to the front truck. From the sheave a the chain ispassed directly to thc engine, and is connected to a revolving shaft,which has a geared connection with one of the axles of the same, bywhich it is operated.

. `connection with each other for readily connecting and Ilisconncctingthe cars, whenrequired.

As the connection ofthe continuous chain with the engine is fullydescribed in the patent dated `I `ehruary 5, 1867, a further descriptionis deemed unnecessary.

l After th`e chain' has passed thepullcy a, in its slacked condition, asuccession of rods, E, may take the place of the chain, except enough towind around the shaft in the operation of the brakes, the rods having ahooked The operation is as follows: When the brakes are to be applied,the engineer, by means of e lever, brings the chain-shaft intoconnection with the engine, for tightening the continuous chain. 'Anendless chain may `be used in lieu thereof. As the slack of the chainunder the rear car is rst takenup, the cur spreads from 4the car infront of it, and its brakes are operated, and alike operation isel'ected with all the cars in succession,

f until the front car is reached and operated upon in-like manner, itspreading out from the engine. Thus the bumping of the curs, instopping'the train, is completely obviated.

` What we claim as our invention, and desire to secure by LettersPutent,is

v The arrangement of the continuous chain C and its describedconnecting-rods, when the same is fastened -at one-end te the front caror truck, und operates, in combination with u ixed sh'eave or pulley, on`the rear truck, through a rod or chain connecting directly with thevactuating-devices on the engine, all as and for the purpose set forth.i i

In testimony that the above is our invention, we 'have hereunto set ourhands, and affixed our seals, this twenty-sixth day of March, 1868. l

SAML. McCAMBRIDGE. [L- 5.] EDWARD G. MARTIN. [L. 5.]

Witnesses:

STEPHEN Usrzcn, Tous Wurm.

